Tomb C is a mud mortar brick structure. Its square plan measures 18' 6" externally and 17' 10" internally.
The tomb has turrets at each of its four corners. The turrets have as many as twelve bands of glazed and unglazed terracotta tiles. Some of these ornamental bands related to those on the body of the tombs to create a seamless wrapper effect.
The tomb has three arched entrances on the east, south and north side. All the three entrances are faced with identical ornamentation. The mehrab is located on the west wall.
Simple squinches of three-tiered arches in the four corners transform the square lower story into an octagon, which becomes the drum or base of the dome.
The tomb is in a bad state of decay with most of its dome structure and cupolas of the corner turrets in ruins.

Source:
Khan, Ahmad Nabi. 1990. Islamic Architecture of Pakistan An Analytical Exposition, Volume One. Islamabad: Arab and Central Asian Contributions. pp. 14, 170-171.